RE: [aspectj-dev] perJoinPoint

["Gregor Kiczales" <gregor@xxxxxxxxx>]

Ron Bodkin said: 
> 
> For what's it's worth, you were able to implement this 
> capability by writing an ITD on StaticPart, and weaving
> that into aspectjrt.jar.

Wow, a meta-level aspect.

Now I'll have a real-world example to give when people ask!


> On Behalf Of Ramnivas Laddad
> Sent: Thursday, March 24, 2005 9:24 AM
> To: aspectj-dev@xxxxxxxxxxx
> Subject: Re: [aspectj-dev] perJoinPoint
> 
> I too have come across the same need. In my case, I wanted to store 
> profile information per-join point (static part).
> While using hashmaps works, it is inefficient in many situations.
> 
> A form of per-association will work (and JBoss AOP has such aspect 
> association)
> Actually, there may be need for two kinds of associations: 
> perJoinPointStaticPart and perJoinPoint.
> While these new  aspect associations might work, I have a simpler 
> proposal to address the need.
> I will like to add the following APIs:
> 
>     void JoinPoint.StaticPart.setUserObject(Object)
>     Object JoinPoint.StaticPart.getUserObject()
> 
> And, for symmetry,
> 
>     void JoinPoint.setUserObject(Object)
>     Object JoinPoint.getUserObject()
> 
> Then I will be able to store profile information as follows:
> 
> Object around() : profiled() {
>     long startTime = getTime();
>     Object ret = proceed();
>     long endTime = getTime();
> 
>     ProfileInfo jpStats = 
> (ProfileInfo)thisJoinPointStaticPart.getUserObject();
>     if(jpStats == null) {
>         thisJoinPointStaticPart.setUserObject(new ProfileInfo());
>     }
>     jpStats.record(endTime-startTime);
> }
> 
> Just submitted an enhancement request:
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=89009
> 
> -Ramnivas
> 
> Eric Bodden wrote:
> 
> >-----BEGIN PGP SIGNED MESSAGE-----
> >Hash: SHA1
> >
> >No, this is not easily possible at the moment (see the perobjects
> >discussion we had earlier). One workaround would be to store the
> >joinpoint-specifc state in a hashmap. I think you can even use an
> >identity hashmap, since joinpoints are pooled IIRC.
> >
> >Of course for large problems you might accumulate quite a lot of
> >state over the runtime. But this is more a general problem rather
> >than specific to AspectJ.
> >
> >Eric
> >
> >- --
> >Eric Bodden
> >Chair I2 for Programming Languages and Program Analysis
> >RWTH Aachen University
> >
> >
> >
> >________________________________
> >
> >From: aspectj-dev-admin@xxxxxxxxxxx
> >[mailto:aspectj-dev-admin@xxxxxxxxxxx] On Behalf Of Tavoda Pavel
> >Sent: Donnerstag, 24. März 2005 11:58
> >To: aspectj-dev@xxxxxxxxxxx
> >Subject: [aspectj-dev] perJoinPoint
> >
> >
> >Is it possible to achieve something like perJoinPoint aspect?
> >I would like to calculate some statistics for method execution.
> >
> >TNX
> >
> >Pavel
> >
> >-----BEGIN PGP SIGNATURE-----
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> >ps0sDujWkuwzpDLcv0SMvf1T
> >=rpcS
> >-----END PGP SIGNATURE-----
> >
> >
> >
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> >
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